 /*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 /**
 * Project  : IQQ_V2.1
 * Package  : iqq.app.action
 * File     : IMEventHandlerProxy.java
 * Author   : solosky < solosky772@qq.com >
 * Created  : 2013-3-16
 * License  : Apache License 2.0 
 */
package iqq.app.ui.event;

 import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

 /**
  *
  * 使用这个类简化事件的注册，分发
  * 只需在被代理的类使用@IMEventHandler注解需要处理的事件类型即可
  *
  * @author solosky <solosky772@qq.com>
  *
  */
 public class UIEventDispatcher implements UIEventListener{
     private static final Logger LOG = LoggerFactory.getLogger(UIEventDispatcher.class);
     private Map<UIEventType, Method> methodMap = new HashMap<UIEventType, Method>();
     private Object target;
     public UIEventDispatcher(Object target){
         this.target = target;
          for (Method m : target.getClass().getDeclaredMethods()) {
              if(m.isAnnotationPresent(UIEventHandler.class)){
                  UIEventHandler handler = m.getAnnotation(UIEventHandler.class);
                  this.methodMap.put(handler.value(), m);
                  if(!m.isAccessible()){
                      m.setAccessible(true);
                  }
              }
          }
     }

     public UIEventType[] getEventTypes(){
         return methodMap.keySet().toArray(new UIEventType[]{});
     }

     @Override
     public void onUIEvent(UIEvent imEvent){
         Method m =  methodMap.get(imEvent.getType());
         if(m != null){
             try {
                 m.invoke(target, imEvent);
             } catch (Throwable e) {
                 LOG.warn("invoke IMEventHandler Error!! {}.{}(..)", getClass(), m.getName(), e);
             }
         }else{
             LOG.warn("IMEventHandler Not Found!! imEvent = {}", imEvent);
         }
     }
 }
